【转】用java将pdf转换成jpg图片的代码

这段代码将能够将pdf转换成jpg图片，虽然图片不是很清晰，但已经够用了，因为我只想要封面的图片做文档的缩略图。

package pdf;

import java.awt.Image;

import java.awt.Rectangle;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import javax.swing.SwingUtilities;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

import com.sun.pdfview.PDFFile;

import com.sun.pdfview.PDFPage;

public class PdfToJpgTest {

public static void setup() throws IOException {

// load a pdf from a byte buffer

File file = new File(

"c://xxxxx.pdf");

RandomAccessFile raf = new RandomAccessFile(file, "r");

FileChannel channel = raf.getChannel();

ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel

.size());

PDFFile pdffile = new PDFFile(buf);

System.out.println("页数： " + pdffile.getNumPages());

for (int i = 1; i <= pdffile.getNumPages(); i++) {

// draw the first page to an image

PDFPage page = pdffile.getPage(i);

// get the width and height for the doc at the default zoom

Rectangle rect = new Rectangle(0, 0, (int) page.getBBox()

.getWidth(), (int) page.getBBox().getHeight());

// generate the image

Image img = page.getImage(rect.width, rect.height, // width &

// height

rect, // clip rect

null, // null for the ImageObserver

true, // fill background with white

true // block until drawing is done

);

BufferedImage tag = new BufferedImage(rect.width, rect.height,

BufferedImage.TYPE_INT_RGB);

tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height,

null);

FileOutputStream out = new FileOutputStream(

"c://picture//"

+ i + ".jpg"); // 输出到文件流

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

encoder.encode(tag); // JPEG编码

out.close();

}

// show the image in a frame

// JFrame frame = new JFrame("PDF Test");

// frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// frame.add(new JLabel(new ImageIcon(img)));

// frame.pack();

// frame.setVisible(true);

}

public static void main(final String[] args) {

SwingUtilities.invokeLater(new Runnable() {

public void run() {

try {

PdfToJpgTest.setup();

} catch (IOException ex) {

ex.printStackTrace();

}

}

});

}

}

文章来源：/kiss_the_java/article/details/4538105

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